CAMRT Radiography Practice Exam

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What is the effect of a larger angle on the effective focal spot size?

It makes the effective focal spot larger
It has no impact on the size
It makes the effective focal spot smaller
It changes the shape of the focal spot

The correct answer is: It makes the effective focal spot larger

When considering the relationship between the angle of the target and the effective focal spot size, a larger angle results in an increase in the effective focal spot size. The effective focal spot is influenced by both the actual focal spot size and the angle at which the x-ray beam is emitted from the target. As the angle increases, the projection of the focal spot onto the image receptor becomes larger. This is crucial in radiography because a larger effective focal spot can result in decreased spatial resolution and can also affect image quality by introducing more geometric unsharpness. Understanding the impact of target angle on effective focal spot size is essential for radiographers when optimizing imaging parameters for quality radiographic images.